Glitch Sequencer is a free cellular automaton based MIDI sequencer for the PC and Mac. It offers an interesting style of composition based on evolving patterns and is great for fast, fluid experimentation.

Sibelius Scorch is the amazing free web browser plug-in that lets you play, transpose, change instruments, save and print your Sibelius scores on the Internet.

VST.NET allows VST Plugin developers to write Plugins in any .NET language. It makes the transition between the C++ and .NET world smooth and easy. The Framework built on top of the interop layer provides a clear and structured architecture accelerating development considerably.

VST.NET targets the .NET 2.0 framework (runtime). The code was written with VS2008.

MiniHost is a powerful and full-fledged ASIO host that loads a VST plugin (instrument or effect) and processes it in realtime.
It offers many features that other hosts don't have, for example:
- arpeggiator, step-sequencer, CC gater, chordmaker included
- send MIDI data to VST plugins from external MIDI inputs, a resizable virtual MIDI
keyboard, the computer keyboard or MIDI files
- process live ASIO audio input or a WAV file
- record audio output to WAV (16 and 32 bit)
- browse through the presets
- powerful preset manager included, allows easy organisation of all presets
- preset randomizer with script support and mutate option
- drag n' drop support
- support for VST MIDI plugins that generate MIDI data

Hydrogen is an advanced drum machine for GNU/Linux. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.

The free Notation Player displays music (.mid, .kar, or .not ) files as sheet music that you can view on the screen while the notes play, and also print.

Drums++ is a programming language designed for sequencing music through drum machines. It uses simple C ideas, for example // and /* */ comments and { } to seperate sections.

kunstderfuge.com is the largest resource for classical music in MIDI format.

RtMidi is a set of C++ classes (RtMidiIn and RtMidiOut) that provides a common API (Application Programming Interface) for realtime MIDI input/output across Linux (ALSA), Macintosh OS X, SGI, and Windows (Multimedia Library) operating systems. RtMidi significantly simplifies the process of interacting with computer MIDI hardware and software.